18t^2-3t-5=0

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Solution for 18t^2-3t-5=0 equation:


Simplifying
18t2 + -3t + -5 = 0

Reorder the terms:
-5 + -3t + 18t2 = 0

Solving
-5 + -3t + 18t2 = 0

Solving for variable 't'.

Begin completing the square.  Divide all terms by
18 the coefficient of the squared term: 

Divide each side by '18'.
-0.2777777778 + -0.1666666667t + t2 = 0

Move the constant term to the right:

Add '0.2777777778' to each side of the equation.
-0.2777777778 + -0.1666666667t + 0.2777777778 + t2 = 0 + 0.2777777778

Reorder the terms:
-0.2777777778 + 0.2777777778 + -0.1666666667t + t2 = 0 + 0.2777777778

Combine like terms: -0.2777777778 + 0.2777777778 = 0.0000000000
0.0000000000 + -0.1666666667t + t2 = 0 + 0.2777777778
-0.1666666667t + t2 = 0 + 0.2777777778

Combine like terms: 0 + 0.2777777778 = 0.2777777778
-0.1666666667t + t2 = 0.2777777778

The t term is -0.1666666667t.  Take half its coefficient (-0.08333333335).
Square it (0.006944444447) and add it to both sides.

Add '0.006944444447' to each side of the equation.
-0.1666666667t + 0.006944444447 + t2 = 0.2777777778 + 0.006944444447

Reorder the terms:
0.006944444447 + -0.1666666667t + t2 = 0.2777777778 + 0.006944444447

Combine like terms: 0.2777777778 + 0.006944444447 = 0.284722222247
0.006944444447 + -0.1666666667t + t2 = 0.284722222247

Factor a perfect square on the left side:
(t + -0.08333333335)(t + -0.08333333335) = 0.284722222247

Calculate the square root of the right side: 0.533593686

Break this problem into two subproblems by setting 
(t + -0.08333333335) equal to 0.533593686 and -0.533593686.

Subproblem 1

t + -0.08333333335 = 0.533593686 Simplifying t + -0.08333333335 = 0.533593686 Reorder the terms: -0.08333333335 + t = 0.533593686 Solving -0.08333333335 + t = 0.533593686 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.08333333335' to each side of the equation. -0.08333333335 + 0.08333333335 + t = 0.533593686 + 0.08333333335 Combine like terms: -0.08333333335 + 0.08333333335 = 0.00000000000 0.00000000000 + t = 0.533593686 + 0.08333333335 t = 0.533593686 + 0.08333333335 Combine like terms: 0.533593686 + 0.08333333335 = 0.61692701935 t = 0.61692701935 Simplifying t = 0.61692701935

Subproblem 2

t + -0.08333333335 = -0.533593686 Simplifying t + -0.08333333335 = -0.533593686 Reorder the terms: -0.08333333335 + t = -0.533593686 Solving -0.08333333335 + t = -0.533593686 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.08333333335' to each side of the equation. -0.08333333335 + 0.08333333335 + t = -0.533593686 + 0.08333333335 Combine like terms: -0.08333333335 + 0.08333333335 = 0.00000000000 0.00000000000 + t = -0.533593686 + 0.08333333335 t = -0.533593686 + 0.08333333335 Combine like terms: -0.533593686 + 0.08333333335 = -0.45026035265 t = -0.45026035265 Simplifying t = -0.45026035265

Solution

The solution to the problem is based on the solutions from the subproblems. t = {0.61692701935, -0.45026035265}

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